Plaster board



Sept. 13, 1932. F. M. VENZIE: LSTLZOQ PLASTEH BOARD Filed April 2e. 1950 "r ai;

v INVENTOR. n FEEDER/CWM VFA/21E Patented Sept. 13, 1'932 rsu-zoja FREDERCK 1v1. vnNzrE; or rnrrnnnnrnrn; PENNSYLVANIA.

rLAs'rEn BOARD Apllication filed 'AprilV ze,

This invention, 4generally stated, relates to` a building structure'such as is employed for interior constructionssuch as walls, partitions, and ceilings and has more especial relation Vto an improved plaster board such as is calculated to receive a finishing coat `of plaster. Y

Plaster boards of the general type under consideration are of rectangular configura- 19 tion and are composed of body portion of plaster-like composition suiciently. soft to permit the same being readily cut and nailed to place in the structure being formed. Fractice dictates that thecomposition body, unless l of relatively large cross-section, readily breaks; and further, ifY formed sufhciently thick in cross-section to overcome the fault of ready breakage, is far too bulky for. desired a thin paper covering in order to holdhthe plaster composition in' place. This is an eX- pensive procedure and is not altogether satisfactory for the reason that the plaster board isstill subject to more or less ready breakage and may be easily torn apart.` l I have discovered that by introducing a suitable reinforce to the body ofa relatively thin plaster board lI amv enabled `to so strengthen the plaster boardthat it ispractically impossible to `tear the same apart' un- 'der unusual conditions, and that under nor-` mal or ordinary working conditions breakage is reduced to a minimum, and thatl may dispense entirely with the paper cover or en velope for strengthening purposes, although under certain conditions Where it is deemed necessary or desirable I may employA upon one face ofthe plaster board a thin sheet of paper properly processed to resist dampness.

composition having embeddedtherein one or more .Sheets of .Coarse meshreinforcns mateforcement;

The leading object of the present invention.

boardrwth its paper cover broken away. y

1930.- serial No. 447,586..

may be readily cut. l A further object of thepresent inventionl is to provide a plaster board of the character: stated having embedded therein one or fmore rial as burlapsor other woven material i sheetsof coarsely woven material the. mesh, 51';

of whichpermitsftherelatively soft body: penetrating the sheet .or sheets of Woven material to provide in effect a unitary or inte ral structure re uirinoin fact a cuttine. es()M process to destroy its eiiiciency. i

A further object of the present invention is to provide a plaster board of the ,character stated and reinforcedY as described .having thatface thereof adapted to receive a coating 6m ofplaster scored in order that anfeificient bond may be secured between the plaster-likeY body of the plaster board and thecoating of plaster. A f l I "Withtheseand'other objects. view, als. 79..

Will h'heililafter appear, the invention consists?` O the IIOVel. construction 'hereinafter ldi scribed-and finallyclaimed. Y The nature, -characteristic features .and

scope of the inventionl will be more fully-,un- 75;VA y

derstgod from the following description takenV `in connectionwith the. accompanying draw-. r

ing famine-part hereof., and. in which n Fig. l is a perspective view of a plaster board embodying the invention and illustrat- 8 0.' ing the same as having twoplane surfaces; i

Fig. 2 is asimilar view of the same )ontA having a some rhat modiliedyformA of reinyFig. 3 is a viewsimilar to Fig. l, but illus-j 35v trating thepl'aSter boardas having a roughened'surfaceg) p, .Y

f Figl is a fragmentary view in section of the plastervboard ask having a plane surface,-

a roughened surface nd a reinforcement 90 similar tothat'shown in 2; 1 i

` F. ig. 5.is a view similar to Fig.4 but'showing a .paper covering applied to the unroughened surfaces; Y

' Fig. f6 is a `view similar to Fig. 5 but show- 95 v ing the paper covering as having a 4coating of moiture resisting material applied theretoganv i 1' Fig. 7 .iszy a topor plan view cfa-plaster For the purpose of illustrating myinventionI have Vshown in the accompanying drawing several forms thereof which are at present preferred by me, since the same have been found in vpractice to give satisfactory and reliable results, although it is to be understood that thejvarious instrumentalitiersvof which my invention consists can be variously arranged and organized and that my invention is not limited to the precise arrangement and organization of the instrumentalities as herein shown and described.

In the manufacture of my novel plaster board which is of rectangular `form,.relall tively thin, andzrelatively soft, form Vthe body 10 of a plaster-like Vcomposition which Y l may be of any desired combination of mate- 'in' dry powdery form, and in suitable prorials to providel a lire-resisting structure. InV

practicey good results have beeiiobtained-by employing plaster, cork, and silicate of soda portions, to which is added other desired ingredients and suliicient water to render the mixture plastic to be moldedto desired shape. Such a plaster board 'is very light in weight, is` porous, but is readily breakable because it is relatively dry and powder-like. To

Vstrengthen and reinforce such body 10, I

embed therein, "at the time of molding, a sheet or sheets of loosely woven burlap 'designated 11. AI prefer to use burlap because'iti is very cheap and has a very coarse mesh, so

n that the plaster composition may readily pass between the mesh and in e'ect form an inte-V gral 'structure which makes it relatively difficultto te'arjor vbreak the body 10v unless the same is cut. 'YWhile I prefer to use burlap because itis cheap and of coarse Vmesh,fo`bvi ouslyk other reinforcing material which is woven in character maybe employed, as for instance: iish net, strong grades of linen or` cottonmosquito netting, and wire netting. Referring now to Fig. n1', the plaster board 10 whichl is relatively iire-proofin make-up is provided with plane surfaces '12 and has lembeddedin the body of the plaster board a' singlesheet of loosely woven burlap.

` The construction of parts shown ,in Fig. 2 is similar in all respects to that shown in Fig. 1 except that two sheets of loosely woven burlap, spaced apart, are employed. The construction shown in Fig. 3 ris similar in all respects to thev showing made in o Fig. 1with the exception that yone surface of the plaster board is roughened to more readily accept a .coat of plaster. The specific form of roughened surface shown. comprises a corrugated-like surface 13 which may be ob-v tained by scoring the surface of the plaster board. A

The showing made in'Fig. 4 is similar in all respects to the construction showiiinFigB with the exception that two sheets of burlap reinforcement are employed instead of the' single sheet yof burlap reinforcement shown in Fig. 3. f

The showing made in Fig. 5 is similar in all respects to the construction shown in Fig. .4

with the exception that a thin sheet of paper 14 is applied to one face and'two sides of the plaster board.V

The showing made in Fig. v6 similarin all respects to the construction shown inV Fig.

5with the exception that the sheet of paper 'lll'may `have applied thereto a coating 15 of any desired damp-proofing materia-l, asas-y phaltum paint.

yIhave` describedV a number of dierent forms in which my plaster board may 'be manufactured, all of said constructions, however, embodying a'plaster board of moreforless fragile material reinforced by one 'ori more sheets of ,looselywoven material, as burlap. InsomeV instances itis desirableto have plane surfaces for the plaster board,v` and in other cases it is desirable to have'the same roughenedto morev readily accept a coating of plaster. In some instances it also-be desirable toaddY to the plaster board a paper covering to resist dampness and ,mois-v ture.

or-sawed. Not only is my plaster board possessed ofthe above advantages, but it alsosound resisting in chara cter'.

`In the above described plaster ferfflrstgto form a'plaster board of plasterof Paris in the proportion of about 80% in bulk and add about 10% of powderedcork and abouty 10%v ofV asbestos.. When mixing the above ingredients with water I add 'about 20% of silicate ofY soda to render theliinished. yplaster boa-rd impervious to water. 1- l The plaster board above described iis ofv a cross-section which does notA exceed-j one half inch in thickness and it is often desirable to make the plaster board so that it measuresl A construct-ion suchfas is above described yis light, strong, and durable yand' formsa Vplaster board which is very diiicult-to break orY tear apart, but whichmay be readily cutf sis iio

in thickness as low as gof an' inch, as where, i

for instance, ythe plaster board is employed `for backingother softer materialin which designs are required. :v

. Referring now to Fig.,7, I show a. plaster board body 16 which maybe reinforced or" not as desired and has applied to; a face. thereof a thin sheet of paper'l'? which is provided with apluralityof cuts orscores by the cuts 18 and thereby prevents thepaper pulling the body out ofplace or warping the same. By staggering the cuts 18 as shown- I iis itc isleV the paper is prevented from shrinking in a direct line. Y Y

I am aware that the invention may be em-V bodied in other specific forms Without departing from the spirit or essential attributes thereof, and I therefore desire lthe present embodiment to be considered in all respects as illustrative and not restrictive, reference being had to the appended claim rather than l` 1 to the foregoing description to indicate the scope of the invention.

What I4 claim is: A plaster board of the character stated comprising a rectangular shaped, relatively thin body of plaster composition of dry pow# dery consistency the particles thereof being held together by a reinforcing sheet of fibrous material only composed of loosely Woven vWets and Warps which material may be readily severed, said sheet being embedded in said body throughout its extent considered in length and breadth, the inner face of said body having a plane surface, and the outer face of said body being corrugated in parallelism with the Wefts of saidk sheet of fibrous y K material to provide a roughenedsurface more readily to accept a coat of plaster, anda thin sheet of paper possessing moisture resisting properties applied tothe inner plane face' of said body, the combined body, sheet of,"

fibrous material, and paper-forming a unitary structure.

FREDERICK M. VENZIE. 

